feat: sort address-autocomplete options to better highlight flat/parent relationships
#599
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See https://trello.com/c/iZa7ZABT/3472-show-if-there-are-multiple-addresses-in-a-building & this #planx-design thread https://opensystemslab.slack.com/archives/C04DZ1NBUMR/p1767821240370329
Before (see 231 Kentish Town Road, flats are separated and further down selection list):

After (flats now alongside "parent"/primary address):
